@dosolly On my Volla it isn't activated after cold boot and I can't activate it through system-settings. So I've created a systemd-timer and a corresponding systemd-service that enables CB via ofona-scripts.
Timer:
[Unit]
Description=Aktivieren von Cell-Broadcast
[Timer]
OnBootSec=2min
Unit=enable-cbs.service
[Install]
WantedBy=multi-user.target
Service:
[Unit]
Description=Aktivieren von Cell-Broadcast
[Service]
Type=simple
ExecStart=/usr/share/ofono/scripts/enable-cbs
[Install]
WantedBy=multi-user.target
After that you have to enable timer and service and CBS is enabled 2 minutes after a cold boot.
The CB-test yesterday showed me, that it's working (before, there was no way to check it )